Abstract:

Traditional autonomous constellation mainly concerns about inter-satellite position measurement. It lacks effective means to overcome the overall constellation rotation. This paper uses a module of inter-satellite measurement with additional parameters including velocity, delay error and clock error, and describes the dispelling ionosphere scattering technique and the method of achieving time and position decoupling. By using GPS, accuracy of LEO satellites in constellation is improved considerably, which offers the entire constellation a fixed time basis simultaneously. Simulation results show that the module with additional parameters has higher accuracy than the traditional module measurement of the entire constellation. Meanwhile, GPS can suppress positioning and clock errors caused by the location error of satellite.

Key words: constellation, autonomous navigation, double frequency, decoupling